Trouble code 00P38 on a 2004 dodge 2500

Hi.

First of all most of the codes you posted are companion codes (OEM if I remember), I would check with some OBDII scanner for the generic codes (For instance : P0447) first then I can give you a hand. That way I can direct my diagnosis on the correct circuit or component.

The engine computer has detected a fault in one of the engine sensors or controllers or switches that it controls. The fault is what trips the light to on, and sets a trouble code in its memory. To get the code, you have to hook up an OBD-II code reader or scanner. When the mil light stays on, it means the fault is still present.
Temperature change should have no effect on the computer or its engine management. Occasionally, computers have been known to set false codes, but rarely. Have the computer scanned to see what trouble codes you get.

Def running in limp mode. If the engine light is red would def put it on a garage scanner, dont know how good youre scanner is.

If you are running any extra systems, ie amps, subs, high watt speakers, etc. etc. you may need to get a better batter, like the blue. or yellow top one. check with auto zone.

The lught can be reset with an OBDII scanner. Most auto parts places like Advance or Autozone will read and clear the code for free.

are you checking code with a small simple scanner this will not always work, a larger more sophisticated unit may find code or runs codes at over 2500 rpms when light comes on

run scanner for trouble codes

Some of the things that I would consider are a plugged PCV valve, a vacuum leak, a cracked distributor cap, or a faulty voltage regulator. I would also check the condition of the ignition coil. And even though the check engine light is not on, I would have the vehicle scanned to see if any fault code(s) are stored in the computer. (Never trust a light to not be out)Hope this helped and good luck.

if u had the engine runnig while u filled the tank? if so u have triggered the evaporative emissions system to set a code and turn on the check engine light, go to Kragen and have them run the trouble code test, then ask if they could clear the code for u, it is free..

Hello
Welcome to FY
I would check your speed sensor located on the rear end this is on top of the housing this will throw that code too.
RD